Full list of all 44 Assassin's Creed achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Achievements they've won
Achievements they've not won
Perform 50 leap of faith.
You've slain Garnier de Naplouse, Hospitalier Leader in Acre.
Kill one of your main targets like a true assassin.
Defeat 100 opponents without dying.
You've slain Talal, Slave Trader of Jerusalem.
Perform 100 Counter Kill in Fights.
Perform 50 Combo Kills in Fights.
You've slain Tamir, Black Market Merchant in Damascus.
Jump through 20 merchant stands.
You have found the traitor and have brought him before Al Mualim.
You've protected Masyaf from the Templar invasion.
You've successfully completed the Animus tutorial.
Complete Assassin's Creed.
A strange vision has appeared to you. What could it mean?
Kill every Templar.
Find All of Richard's Flags in the Kingdom.
Find All Flags in Masyaf.
Find All Flags in Jerusalem.
Find All Flags in Damascus.
Have a complete Synchronization bar.
You've slain Abul Nuqoud, Merchant King of Damascus.
You've slain Majd Addin, Regent of Jerusalem.
You've slain William of Montferrat, Liege-Lord of Acre.
You've slain Sibrand, the Teutonic Leader of Acre.
You've slain Jubair, the Scribe of Damascus.
You've slain Robert de Sable, but there is one more...
Complete all Reach High Points.
See 85% of all the memory glitches.
Complete every free mission in Acre.
Complete every free mission in Jerusalem.
Complete every free mission in Damascus.
Go through every dialog with Lucy.
Assassinate all your targets with a full DNA bar.
Last 10 minutes in open conflict.
Assassinate 100 guards.
Defeat 25 guards in a single fight.
Perform 50 stealth assassinations.
Pickpocket 200 throwing knives.
Use Scholar blending 20 times.
Kill 75 guards by throwing knives.
Grab and Throw 25 Harassers.
Find All Teutonic Flags in Acre.
Find all Templar Flags in Acre.
Find All Hospitalier Flags in Acre.